On-line testing method for studying fuel cell stack assembly force and sealing

Abstract

The invention discloses an on-line testing method for studying fuel cell stack assembly force and sealing. The on-line testing method for studying the fuel cell stack assembly force and the sealing is characterized by comprising the following steps: assembling fuel cell stacks according to fuel cell assembly methods; placing the assembled fuel cell stacks on a liquid crystal digital display universal tester, supplying pressure, and keeping pressure of the liquid crystal digital display universal tester to be constant; plugging gas ports in one upper end plate shell cover with plugs, and connecting the other upper end plate shell cover with a t-branch pipe to carry out a gas tightness test; opening a high pressure nitrogen steel cylinder, adjusting a reducing valve till that a precision pressure gauge displays a needed test value and remains stable, and observing changing conditions of the precision pressure gauge in preset time; and when the test is finished and if a leakage case does not exist, separating a testing device from the fuel cell stacks, screwing nuts by using a torque wrench, and stopping till that a liquid crystal display panel displays that the pressure is zero. According to the on-line testing method for studying the fuel cell stack assembly force and the sealing, whether the gas leakage of the fuel cell stacks occurs can be monitored in the process of assembly, correction can be carried out in time, loss caused by fuel cell stack disassembly is effectively reduced, and therefore work efficiency is improved.

Description

technical field [0001] The invention relates to the detection of the tightness of the proton exchange membrane fuel cell stack, in particular to an on-line test method for researching the assembly force and the tightness of the fuel cell stack. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that directly utilizes hydrogen energy. PEMFC directly converts the chemical energy stored in hydrogen fuel and oxidant into electrical energy, with high energy conversion efficiency; the fuel cell is environmentally friendly, and the only emission is water. Therefore, fuel cell technology is considered to be the preferred clean and efficient power generation technology in the 21st century. [0003] Proton exchange membrane fuel cell stacks usually include: (1) diversion inlets and diversion channels for fuel and oxidant gas, where fuel (such as hydrogen, methanol or hydrogen-rich gas obtained by reforming methanol, natural gas, gaso...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, during the comprehensive performance test of the battery system, the fuel, oxidant, and cooling fluid are simultaneously connected. The sealing material may decrease due to its own texture, installation, or other factors, so it should be removed first. The possibility of mixing fuel gas and oxidant gas inside the fuel cell, from the perspective of leakage of fuel gas or oxidant gas to the outside of the fuel cell, will greatly reduce work efficiency and cause great economic losses

The reasons are as follows: the fuel cell is disassembled to find the leak point, which is very time-consuming and directly reduces the work efficiency; the original seal is set on the bipolar plate, although the seal was originally connected to the surface of the sealing groove on the bipolar plate There is an adhesive, but because the seal has been fastened to the end face of some sealing areas of the membrane electrode for a long time, a large adhesion force has been generated. When the stack is disassembled to separate the bipolar plate from the membrane electrode, the seal is often The parts are torn off and deformed, which not only makes it impossible to reassemble, but also makes the seals unable to be reused after deformation, resulting in economic losses

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